What is true of matter in ecosystems? A.The primary productivity of an ecosystem does not depend on the availability of nutrients. B.Living things can recycle elements within an ecosystem as long as decomposers are present. C.Matter flows in a one-way direction with a 10% loss at each move up in trophic level. D.Elements continuously cycle between the physical environment and living organisms.

QUESTION POSTED AT 06/12/2019 - 04:08 PM

Answered by admin AT 06/12/2019 - 04:08 PM

Correct answer choice is:

D) Elements continuously cycle between the physical environment and living organisms.


Explanation:


Any nonliving matter that living things want is termed a nutrient. Carbon and nitrogen are parts of nutrients. Unlike energy, the object is converted into ecosystems. Decomposers deliver nutrients when they cut down dead organisms. When one organism eats a different organism, it takes all of its nutrients. Nutrients can also cycle out of an ecosystem. Falling leaves may be moved out of an ecosystem by a water. Decomposers cut down dead organisms into nutrients and carbon dioxide, which they respire into the air.

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Related questions

What changes can occur in an aquatic ecosystem as a result of nutrient loading?

Yes, definitely algal bloom is a significant change. What is more important is how the bloom affects other aquatic life. The bloom forms a dense "blanket" of growth, which as it grows rapidly and dies, decomposes. Bacteria feed on this rich organic stuff and use up the dissolved oxygen in the water. As the oxygen levels drop, fish and aquatic insects die. This is the result of the algal bloom.

ANSWERED AT 18/01/2020 - 01:09 PM


QUESTION POSTED AT 18/01/2020 - 01:09 PM

Sharp, jagged peaks are characteristic of fault-blocked mountains. A. True B. False

true hope this helps! :)

ANSWERED AT 18/01/2020 - 01:08 PM


QUESTION POSTED AT 18/01/2020 - 01:08 PM

Which system coordinates the body's response to change in its internal and external environments

The Nervous System coordinates the body's response to environments.

ANSWERED AT 18/01/2020 - 01:06 PM


QUESTION POSTED AT 18/01/2020 - 01:06 PM

Why is meiosis important for organisms? It allows for genetic variation among organisms. It determines which genes are dominant and which are recessive. It produces genetically identical cells. It provides a means of asexual reproduction.

Genetic variation. Meiosis is the combination of 2 haploid cells so it's not asexual reproduction. Meiosis doesn't produce identical cells-mitosis does. And it doesn't determine which genes are dominant or recessive - there are equal chance of inheriting dominant/recessive genes, but the dominant one is expressed as phenotype

ANSWERED AT 18/01/2020 - 01:06 PM


QUESTION POSTED AT 18/01/2020 - 01:06 PM

Which kingdom(s) include organisms that are autotrophic or heterotrophic?

The kingdom where the autotrophic and heterotrophic belong is known to be the bacteria, archaea, eukarya, protista kingdom. There is also kingdom where in they are only autotrophic and this is Plantae kingdom. Also, there are also kingdom wherein they are only heterotrophic and these are fungi and animalia kingdom 

ANSWERED AT 18/01/2020 - 01:04 PM


QUESTION POSTED AT 18/01/2020 - 01:04 PM

When Jacob starts running, his legs move faster and his heart rate increases. Which types of muscles are involved in these changes? A.) Skeletal muscles control his leg movement and smooth muscles control his heart rate. B.) Skeletal muscles control his leg movement and cardiac muscles control his heart rate. C.) Smooth muscles control his leg movement and cardiac muscles control his heart rate. D.) Skeletal muscles control both his leg movement and heart rate.

Answer:

The most appropriate answer would be option B.

The voluntary movements such as leg movements, movement of hands, posture et cetera are controlled with the of skeletal muscles. These are striated muscles which are controlled with the help of the somatic nervous system.

The heart rate is regulated with the help of the autonomic nervous system which controls the cardiac muscles. Cardiac muscles are a special type of striated muscles which constitute the heart tissue.

ANSWERED AT 18/01/2020 - 01:03 PM


QUESTION POSTED AT 18/01/2020 - 01:03 PM

Where in an embryo are the instructions located for how to build organs

All the instructions are encoded in the DNA within the nucleus. We don't fully understand how the zygote, with the same genetic material as our adult cells, instructs the newly developing embryo to form tissues and organs, but it is all in the DNA.

ANSWERED AT 18/01/2020 - 12:59 PM


QUESTION POSTED AT 18/01/2020 - 12:59 PM

Approximately _____ elements occur naturally on earth. 117, 25, 92, 82

Answer: The correct answer for the blank is-

92.

There has been total 118 elements discovered o earth out of which approximately 92 elements are naturally occurring. Other elements are produced by artificial means.

The most abundantly occurring elements are oxygen, nitrogen, carbon, hydrogen, sulfur, and phosphorous.

 

ANSWERED AT 18/01/2020 - 12:58 PM


QUESTION POSTED AT 18/01/2020 - 12:58 PM

Organisms in the same ecosystem are all _______. a. interrogative b. interdependent c. intermediate d. interceptive

The question is asking us to say what organisms in the same ecosystem are. Organisms in one ecosystem are all dependent on each other: they feed on each other or are dependent on the tissues of the other organisms when they die - this is called "interdependence" - dependence from each other , so the answer is b.interdependent

ANSWERED AT 18/01/2020 - 12:58 PM


QUESTION POSTED AT 18/01/2020 - 12:58 PM

Which of the following statements about agricultural societies is true? a. Agricultural societies did not pollute the environment. b. Agricultural societies impacted the environment less than hunter-gatherer societies. c. Agricultural societies had a higher population than hunter-gatherer societies. d. Agricultural societies impacted the environment more than industrial societies.

The correct answer is option C. Agricultural societies had a higher population than hunter-gatherer societies.

The hunting is not a very popular profession now-a-days, but the agriculture is very common and there are many people, who are involved in the profession of the agricultural production. So, the agricultural societies have a much higher population as compared to the that of the hunter-gather societies. Also, the hunting is banned for many animals and cannot produce enough money to support the basic livelihood.

ANSWERED AT 18/01/2020 - 12:58 PM


QUESTION POSTED AT 18/01/2020 - 12:58 PM

Which group of organisms has the derived characteristics of true tissues, bilateral symmetry, and a pseudocoelom?

The group of organisms that has the derived characteristics of true tissues, bilateral symmetry, and a pseudocoelom is the animalia kingdom. They present all of the mentioned characteristics.


An example of a pseudocoelom is the roundworm.


I hope it helps, Regards.

ANSWERED AT 18/01/2020 - 12:57 PM


QUESTION POSTED AT 18/01/2020 - 12:57 PM

Which group of organisms has the derived characteristics of true tissues, bilateral symmetry, and a pseudocoelom?

The correct answer is Nematodes, also known as roundworms. They fit the description that you provided.

ANSWERED AT 18/01/2020 - 12:56 PM


QUESTION POSTED AT 18/01/2020 - 12:56 PM

The stress force that causes a mass of rock to pull or twist in opposite directions in called ______

Shearing in continuum alludes to the event of a shear strain, which is a distortion of a material substance in which parallel inner surfaces slide past each other. It is instigated by a shear worry in the material. It happens when the material is yielding. The way toward shearing a material may actuate a volumetric strain alongside the shear strain.

ANSWERED AT 18/01/2020 - 12:53 PM


QUESTION POSTED AT 18/01/2020 - 12:53 PM

Which statement about enzymes is true

Answer:

Explanation:

Enzymes don't take part in a reaction but just speeds up a reaction

ANSWERED AT 18/01/2020 - 12:51 PM


QUESTION POSTED AT 18/01/2020 - 12:51 PM

Which of the following would accompany a high-fat meal moving through the digestive system? The release of gastrin, which triggers the liver to release bile The release of gastrin, which triggers the stomach to release pepsin The release of secretin, which triggers the liver to release bile The release of secretin, which triggers the stomach to release pepsin

The answer is The release of secretin, which triggers the liver to release bile.

Secretin is the hormone released from the duodenum. It signals the secretion of bile in the liver. Bile helps digestion of lipids in the stomach.
Through the process of elimination:
- Pepsin is a hormone that breaks down proteins to the smaller peptides. So, pepsin does not breaks down lipids of high-fat meal.
- Gastrin is a hormone that triggers the gastric glands to secrete hydrochloric acid and pepsinogen, inactive form of pepsin.

ANSWERED AT 18/01/2020 - 12:51 PM


QUESTION POSTED AT 18/01/2020 - 12:51 PM

Which is not a major similarity or difference between freshwater and marine ecosystems? I believe its b a. both support a large number of plants and animals adapted for aquatic living b. ocean and freshwater system conditions generally remain constant throughout the year c. freshwater ecosystems have a very low salt concentration, and include ponds, lakes, streams, wetlands, and rivers d. saltwater ecosystems have a high salt concentration and include oceans, coral reefs, and estuaries

The correct answer is:

b. ocean and freshwater system conditions generally remain constant throughout the year .

Explanation:

ocean and freshwater system requirements frequently remain constant completely the year. This is not true because they are very inconsistent. For examples, freshwater rivers can completely freeze during the winter while oceans can't freeze entirely, not even a bit. Also, the animals inside have radically changed body structures to fight these changes.

ANSWERED AT 18/01/2020 - 12:46 PM


QUESTION POSTED AT 18/01/2020 - 12:46 PM

The three stages of cellular respiration are glycolysis Krebs cycle and the electron transport chain when do cells exhibit all these stages

They exhibit all the stages when its the presence of oxygen only.

ANSWERED AT 18/01/2020 - 12:41 PM


QUESTION POSTED AT 18/01/2020 - 12:41 PM

Karyotypes can be studied to determine an organism’s chromosomal makeup and to detect genetic defects. Turner syndrome occurs when a female has an incomplete set of sex chromosomes. Symptoms of Turner syndrome include swollen hands and feet, short stature, and infertility. Which type of chromosomal mutation is responsible for causing Turner syndrome?

The answer is deletion of X chromosome in females.


Turner syndrome is caused by completely or partly missing of X chromosome in females. it is known that females have two X chromosomes with karyotype 46,XX. Females with turner syndrome have karyotype 45,XX. This syndrome is characterized by infertility, short statue, swollen hands and feet, as well as heart defects, diabetes, webbed neck (extra skin on the neck), skeletal abnormalities.

ANSWERED AT 18/01/2020 - 12:41 PM


QUESTION POSTED AT 18/01/2020 - 12:41 PM

Which of the following is NOT a biological environment factor? symbiosis competition predation none of the above

The answer is none of the above 

ANSWERED AT 18/01/2020 - 12:37 PM


QUESTION POSTED AT 18/01/2020 - 12:37 PM

What is the term for an organism that must eat its food for energy

It is called a consumer. 

ANSWERED AT 18/01/2020 - 12:36 PM


QUESTION POSTED AT 18/01/2020 - 12:36 PM

A land-dwelling organism, A, and an aquatic single-celled organism, B, are represented below.

Using the image that represents the land-dwelling organism and an aquatic single celled organism. The statement that best explains how A and B are able to survive in their environments is…


Answer: A) The organelles in B perform similar functions to the organ systems in A.


Please see image attached to better understand how we arrived to the conclusion.


I hope it helps, Regards. 

ANSWERED AT 18/01/2020 - 12:35 PM


QUESTION POSTED AT 18/01/2020 - 12:35 PM

Which of the following is not true about Polar bears?a. They all hibernate.b. They have black skin that helps them absorb heat.c. Their fur is transparent and hollow and helps trap heat.d. They have oversized paws with rough pads that help them walk on snow and ice.

a., They all hibernate is false. Polar bears do not hibernate at all. They are active all year long (except for the females that are pregnant). They do not need to hibernate as they are able to live off of fat stores for several months at a time.

ANSWERED AT 18/01/2020 - 12:35 PM


QUESTION POSTED AT 18/01/2020 - 12:35 PM

Which of the following is not true about Polar bears?

After doing an investigation of polar bears. The statement from the options presented below the one that is NOT TRUE is that all polar bears hibernate. They remain active throughout the year.


Answer: A) They all hibernate.


I hope this helps, Regards.

ANSWERED AT 18/01/2020 - 12:34 PM


QUESTION POSTED AT 18/01/2020 - 12:34 PM

Which organism was most likely to live at the same time as brachiopods? trilobites placoderms ammonites gastropods

The organism that was most likely to live at the same time as brachiopods were
Trilobites

Brachiopods were like lamshells. They lived underwater, had soft bodies and their shells were bivalves.
Trilobites had three-lobed bodies. They could swim, crawl, and burrow.

ANSWERED AT 18/01/2020 - 12:33 PM


QUESTION POSTED AT 18/01/2020 - 12:33 PM

Which level of biological classification is the lowest level that butterflies and dogs have in common ?

 phylum .....................

ANSWERED AT 18/01/2020 - 12:32 PM


QUESTION POSTED AT 18/01/2020 - 12:32 PM